LMS TxLO noise

Andrey Sviyazov andrey.sviyazov at fairwaves.ru
Mon Jul 30 08:07:58 UTC 2012


Hi Thomas.

Thank you very much for good news.
Sylvain and everybody who discussed, thanks a lot.
Seems, now I could finalize new revison of the BOM.

Best regards,
Andrey Sviyazov.



2012/7/30 Thomas Tsou <ttsou at vt.edu>

> Hi Andrey,
>
> Parts arrived yesterday and I made modifications for the 100 kHz loop
> filter and tested today. The entire 900 band is below 1.5 / 5 with a
> good margin.
>
> http://filebox.vt.edu/users/ttsou/http/umtrx_945mhz_4.bmp
>
> The lower part of the 1800 is also below the target value. I was not
> successful at 1885 MHz, though further calibration is possible (manual
> calibration at each frequency takes a very long time). I will perform
> additional tests tomorrow.
>
> http://filebox.vt.edu/users/ttsou/http/umtrx_1825mhz_4.bmp
> http://filebox.vt.edu/users/ttsou/http/umtrx_1825mhz_noise.PNG
>
>   Thomas
>
> On Wed, Jul 25, 2012 at 9:52 PM, Thomas Tsou <ttsou at vt.edu> wrote:
> > On Wed, Jul 25, 2012 at 1:41 PM, Andrey Sviyazov
> > <andrey.sviyazov at fairwaves.ru> wrote:
> >> Hi Thomas.
> >>
> >> Digikey part numbers links:
> >> C82 = 100pF, C83=1500pF, C84=33pF, R106=2.2k, R109=3.3k, L6=0.022uF.
> >>
> >> But you'll remove 100pF capasitor from position C45, so you could use
> it for
> >> C82.
> >> BTW, how long time required to delivering from the DigiKey?
> >
> > Thank you for the links. Parts are ordered. Digikey orders usually
> > arrives in 2 days.
> >
> >   Thomas
>
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